<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    
  </style>
</head>
<body>
  
</body>
<script>

  // var arr = ["hello", 345, true];
  // var arr2 = new Array("hello", 345, true);
  // console.log(arr)
  // console.log(arr2)
  
  // var arr = [25];
  // var arr2 = new Array(25);
  // console.log(arr);
  // console.log(arr2);

  // console.log(arr.length);
  // console.log(arr2.length);


  // 区别：


  
</script>
</html>